“I don’t really have a set headcanon for anything and I love almost all of the Poland headcanons, but this idea intrigues me and I noticed that while someone already posted a “Poland is transgendered” headcanon, no one’s really posted a pairing headcanon with Liet concerning it. I think it’s cute.” — sugarmaplewings
“The first B-day date for Poland was May 3rd, because of the Constitution. Earlier, he didn’t think about B-day, but Name day, of course.
Next it was exactly July 22nd, but not because of communists. It was because of France. Napoleon signed the Constitution of Duchy of Warsaw on that day. So Feliks used this date until Independence time (November 11th). Then communists made him turn it back to July 22nd.